Finding the Fourth Proportional to 396,499.49, 547,154.63 and 215,207.52

Step by Step Solution

1. Step 1: Write the proportion equation
   396,499.49 : 547,154.63 = 215,207.52 : x
2. Step 2: Convert to fraction form
   396,499.49/547,154.63 = 215,207.52/x
3. Step 3: Cross multiply
   396,499.49x = 547,154.63 × 215,207.52
4. Step 4: Simplify right side
   396,499.49x = 117,751,790,978.82
5. Step 5: Solve for x
   x = 117,751,790,978.82/396,499.49
6. Step 6: Final answer
   x = 296,978.42